A large number of drugs that are currently available are “one size fits all,” but everyone doesn’t respond to them in the same way. It can be difficult to predict who will benefit from a medication, who will not respond at all, and who will experience negative side effects. Adverse drug reactions are a significant cause of hospitalisations and deaths all across the globe.Research and Developments in Genetics over the years can assist us in learning how inherited differences in genes affect the body’s response to medications. These genetic differences can be used to predict whether a medication will be effective for a particular person and to help prevent adverse drug reactions. Thus, in a nutshell, using Pharmacogenomics a doctor will be able to develop effective, safe medications - dose adjustments and alternative recommendations that will be tailored to a person's genetic makeup.